Robert Rothbart (Hebrew: רוברט רות'בארט; born Boris Kajmaković on June 16, 1986) is a Bosnian-Israeli professional basketball player playing the position of center for Elitzur Eito Ashkelon of the Israeli National League.

Although he initially committed to Indiana University, Rothbart decided in the summer of 2004 to skip college and play in Europe, where he's active today.

Prior to the 2009–10 season, Rothbart signed with Elitzur Maccabi Netanya B.C., with whom he reached the Israeli Basketball State Cup semi-finals.

Rothbart helped Kiryat Gat reach the Liga Leumit Finals, where they eventually lost to Hapoel Be'er Sheva.

On June 4, 2018, Rothbart returned to France for a second stint, signing a one-year deal with a second year option with ESSM Le Portel of the LNB Pro A league.